Pneumatic tire-pressure gauge



June 23, l-925.

P. E. WELTON PNEUMATIC TIRE PRESSURE GAUGE Filed Jan.`

.lll-nl... nnnnnnnnnnnnnnnn |l Patented June 23, 1925.

UNITED STATES PATENT OFFICE@ i PARK E. WELTON, 0F CUYAHOGA FALLS, OHIO,ASSIGNOR T0 TIREGAGE VALVEiCOR- PORATION, OF CHARLESTON, 'WEST VIRGINIA,A CORPORATION OF WEST VIRGINIA.

PNEUMATIC TIRE-PRESSURE GAUGE.

Application filed January 17, 1923. lSerial No. 613,252?.V

To all whom it may concern.'

Be it known that I, PARK E. WELToN,.a citizen of the United States,residing at Cuyahoga Falls, in the county of Summit and State of Ohio,have invented new and useful Improvements in Pneumatic Tire- PressureGauges, of which the following 1s a specification. U,

Tire `pressure gauges formed with altire stem and sliding plunger haveheretofore been made with a rubber tube forming a means of connectionbetween the plunger and the inner part of the tire stem andcommunicating the pressure from the tire to the stem and also a conduitfor inflating the tire. With most such devices it is desirable toassemble the parts by turning some parts of the mechanism which includesthe plunger and the rubber tube. It is also desirable with thesestructures to lock the plunger against turning so as to adapt it toreceive the strain incident to attaching a tire pump. The rubber tube issubjected to severe use and if twisted often develops leaks at the pointat which it is twisted. In such devices it is also desirable to limitthe movement of the plunger. The present invention is designed toprovide a convenient means for locking the plunger and for limiting itsoutward movement in which the possibility of twisting the rubber tuberegardless of the manner of assembling the device is obviated. Otherdetails of the invention will appear from the specification and claims.

vThe invention is illustrated in the accompanying drawings as followsFig. 1 shows a central vertical section through'the tire stem.

Fig. 2 a section on the line 2 2 in Fig. 1.

1 marks the tire stem, 2 the head of the stem, 3 a tire tube, 4 aclamping plate, 5 a spreader and 6 the clamping nut. These so far asdescribed are of general construction.

A sliding plunger 7 is mounted in the stem. It has an inflation opening8 through it controlled by a valve 9 and has a screwthreaded end 9'a bymeans of which the pump may be attached. A spring 10 is secured on ashoulder` 11 at the lower end of the plun er and has its lower endhooked into a was er 12 which is secured in place under the end of thestem, the'stem being screwed into a screw-threaded socket 13 in thehead.

A rubber tube 14 forms a Vmeans of communication between the plunger andthe inner endof the stem. The head 2 is providedwith a nipple 15 whichextends upwardly to within the stem and the lower end of the tube -issecured by a band 16 on the nipple. The upper end of the tube is securedon a nipple l17 at the lowery end of the plunger by a band 18.

A-thimble 19 is adapted to be forced over the end of the stem 1 afterthe parts are assembled and is locked in place by indenting the walls ofthe thimble at 20 into the wall of the stem. The thimble has an inturnedflange 21 which operates against the spring forming la shoulder on thelower` end of the plunger and thus forms a stop limiting the outwardmovement of the plunger. The thimble has a crimped axial inwardprojection 22 engaging the plunger and forming a guide for it and thishas a key 23 pressed in its walls which projects into a key-way 24 inthe wall of the plunger. The locking indenture 20 locks the thimbleagainst turning and the key operating in the key-way locks the plungeragainst turning. y

It will readily be seen that with this structure any convenient means ofassembling Y the parts maybe adopted even though it involves thetwistingrof the plunger and the vthimble is then put in place and locksthe plunger against turning and also forms a stop limiting its outwardmovement.

What I claim as new is 1. In a pneumatic tire pressure gauge, thecombination of a tire stem; avalve carrylng plunger in the stemsubjected to the tire pressure and responsive in movement to vsaidpressure; and a thimble secured to the outer endof the valve stem andforming a stop llmiting the outward movement of the plunger, said stopbeing located at the limit of thel outward movement of the plunger.

2. In a pneumatic tire pressure gauge, the combination of a tire stem; avalve carrying plunger in the stem subjected to the tire pressure andresponsive in movement to said pressure; and a thimble secured to theouter end of the. stem, said thimble having means locking the vplungeragainst turning.

3. In a pneumatic tire pressure gauge, the

combination of a tire stem; a valve carry-y ing plunger in the stemsubjected to the tire pressure and responsive in movement to saidpressure; and a thlmble secured to the outer end of the stem, forming astop limiting the outward movement ott the plunger and llaving meanslocking tlie plunger against turning. v v l 4. In a pneumatic tireypressure gauge, the combination of a tire stem; a valve carryingplunger in the stem subjected to the tire pressure and responsive inmovement to said pressure; and a thimble secured to t'lie outer end ofthe stem having an inturned liange limiting the outward movement 'of theplunger, said `stop being located at the limit of the outward movementof 'the plun'ger. 5. In a pneumatic tire pressure gauge, the combinationof a 'tire stem; a valve carrying plunger in the stem subjected to thetire pressure and responsive in movement to said pressure; and atliimble vsecured to Atlre outer end oi' the stem liavin'g -a keypressed therein for looking the plunger against turning.

6-. In a pneumatic tire pressure gauge, the combination of a tire stem;a valve carrying plunger in tlie stem subjected to the tire pressureandresponsive in movement to said pressure; and a t'liimble secured tothe outer end of the stem by indenting the Walls of the -thimble and thestem, said tllimble controlling the plunger.

7. In a pneumatic vtire pressure gauge, tlie combination of a tire stem;a valve carrying plunger in the stem; a rubber tube connecting theplunger with y'the inner end of the stem, said plunger and tube beirrglassembled vvitli va turning movement of the plunger;

and a thimble secured to 'the outer end of tlre stem, said t'himbleliavi'ng means locking the plunger against turning.

In testimony whereof I have hereunto set my hand. y

PARK E. ,WELTON

